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r-1 F-7 r-1 f-n, r-1, r-1 r7, r. Com. r-1." r--7 r-1 r-11 r- r <br /> RBCA SITE ASSESSMENT <br /> Tier 2 Worksheet 8.1 <br /> Site Name:McDowell and Davis Towing,1360 Escalon Site Location:Escalon,San Joaquin County,CA Completed By,Robert Fourt,CEI Date Completed: 11115I2CO3 4 OF 9 <br /> TIER 2 EXPOSURE CONCENTRATION AND INTAKE CALCULATION <br /> [NDOO}�t I�1Re�R�$URE P,�4LliY)fAY$ qe ,„pay.' _. :.�. . ">..,,,•aas ..+. •xs��a. °�a,1,� CHECKE[3 IF P;4'Tfi1NA�1S ACTtSfE °fie —" ,l - <br /> SUBSURFACE SOILS: Exposure Concentration <br /> VAPOR INTRUSION TO BUILDINGS 1)Source Medium 2)NAF Value(m^3/kg) 3)Exposure Medium 4)Exposure Multiplier 5)Average Daily intake Rate <br /> Receptor Indoor Air:PCE Gom.(myW3)(1)1(2) (IRxEF.EDp(BMAT) (W31kgday) (mgfkg-day}(3)X(4) <br /> Subsurface Soil Conc. <br /> Constituents of Concern m !kg) on-Ed.Cnmmardal C,S4ecomme..W on-Srt.Commemial <br /> Benzene 4.4E-3 1.2E+2 3.6E-5 7.0E-2 2.5E-6 <br /> Eth (benzene 2.6E-1 1.5E+2 1.7E-3 2.0E-1 3.4E-0 <br /> Methyl t-$u I Ether 4.5E-1 4.0E+2 1.1 E-3 2.0E-1 2.2E-4 <br /> Toluene 5.1 E-1 2.0E+2 3.1E-3 2.0E-1 6.0E-4 <br /> Xylene mixed isomers 2.1E+0 3.1E+2 6.7E-3 2.0E-1 1.3E-3 <br /> NOTE: ABS=Dermal absorption factor(dim) BW=Body weight(kg) EF=Exposure frequencey(dayaryr) POE-Point of exposure <br /> AF=Adheranre factor(mg1cm^2) CF-Units conversion factor ET=Exposure time(hrslday) SA=Skin exposure area(cm^2lday) <br /> AT=Averaging time(days) EC=Exposure duration tyrs) IR=Inhalation rate(rn^3tday) <br /> Software: GSI RBCA Spreadsheet Serial. G-491-EFX-872 <br /> ®Groundwater Services,Inc.(GSI),19951997,All Rights Reserved_ Versions 1,0.1 <br />( <br /> I .T <br />